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采用自制的90°模具,分析不同的ECAP挤压路径对AZ31镁合金变形后的微观组织和力学性能的影响;对挤压后的试样进行显微组织观察、硬度测试,研究等通道挤压工艺(ECAP)对AZ31镁合金的晶粒细化效果。结果表明:Bc路径晶粒细化效果较好,随着挤压道次增加,晶粒发生细化,7道次后晶粒尺寸由原来的70μm细化到4.8μm左右;硬度值随道次增加显著提高,3道次后达到最大值90.81MPa,之后随道次增加,硬度略有下降,趋于稳定。
The effects of different ECAP extrusion paths on the microstructure and mechanical properties of AZ31 magnesium alloy after deformation were analyzed by self-made 90 ° die. Microstructural observation, hardness test, Grain Refinement Effect of Technology (ECAP) on AZ31 Magnesium Alloy. The results show that the grain refinement of Bc path is better. With the increase of extrusion pass, the grain refinement occurs. After 7 passes, the grain size is refined from 70μm to 4.8μm. Increased significantly, reaching the maximum value of 90.81MPa after three passes, followed by the increase of pass number, the hardness decreased slightly and tended to be stable.